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NBME 23 Answers

nbme23/Block 1/Question#30

A 52-year-old man comes to the physician because of ...

Pelvic splanchnics

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submitted by sajaqua1(211),

The patient underwent removal of a rectal tumor which had involvement with the prostate. The prostatic capsule is rich with nerves including the pelvic splanchnic nerves, a set of parasympathetic nerves responsible for PNS autonomic regulation. Erections are a parasympathetic function.

A) Gray rami from the sympathetic chain- erections are a parasympathetic function, not sympathetic. Emission of sperm is a sympathetic function, and is directed by the inferior hypogastric nerve. C) Pudendal- the pudendal nerve is a somatic nerve that receives sensation from the penis, posterior scrotum, clitoris, and labia, as well as being responsible for some movement of the pelvic floor, and ejaculation. D) Superior hypogastric nerve- a sympathetic nerve, this contributes to the hypogastric plexus and may also contribute to sympathetic control of emission. E) Ventral ramie of S2-S4- These rami contribute to the pudendal nerve.